Avogadro's number

number of representative particles in a mole, 6.022 X 10²³

empirical formula

a formula showing the lowest whole number ratio of atoms in a compound

hydrate

a compound that has a specific number of water molecules bound to each formula unit

molar mass

the mass in grams of one mole of a pure substance

mole

SI base unit used to measure the amount of a substance,

molecular formula

a formula showing the types and numbers of atoms combined in a single molecule of a molecular compound

percent composition

the percent by mass of each element in a compound

molecule

the representative particle for a covalent compound

formula unit

the representative particle for an ionic compound

atom

representative particle for an element or a metallic substance

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